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https://issues.apache.org/jira/browse/LUCENE-1096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12553817
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Doron Cohen commented on LUCENE-1096:
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It seems that this is a serious problem with Hits based search. An application
deleting returned hits as in this case will actually get "holes" in the
returned docs, every time getMoreDocs() is internally invoked.
For instance, say all docs match, and the app deletes doc 50. Hits 0 to 99 are
ok, they will contain docs 0 to 99. But because of the deletion, hit 100 will
be doc 101, i.e. doc 100 was skipped.
Fixing this behavior is possible in the Hits class if only hits are deleted.
I.e. if, while getting hit n, hits m where m<=n are deleted. But if a higher
doc is deleted, a doc that would be seen later, after more internal calls to
getMoreDocs(), things get more messy, and an ArrayIndexOutOfBound exception can
be caused, as in this bug.
Note that the latter case can also happen if another thread deletes such a
"front" hit doc.
I think the proper exception for the latter case is
ConcurrentModificationException, and Hits should be changed to distinguish
between the two.
> Deleting docs of all returned Hits during search causes
> ArrayIndexOutOfBoundsException
> --------------------------------------------------------------------------------------
>
> Key: LUCENE-1096
> URL: https://issues.apache.org/jira/browse/LUCENE-1096
> Project: Lucene - Java
> Issue Type: Bug
> Components: Index
> Affects Versions: 2.1
> Environment: WindowsXPSP1/Lenovo-T60p
> Reporter: Tushar B
> Assignee: Doron Cohen
> Priority: Minor
> Attachments: TestSearchDelete.java
>
>
> For background user discussion:
> http://www.nabble.com/document-deletion-problem-to14414351.html
> {code}
> Hits h = m_indexSearcher.search(q); // Returns 11475 documents
> for(int i = 0; i < h.length(); i++)
> {
> int doc = h.id(i);
> m_indexSearcher.getIndexReader().deleteDocument(doc); <-- causes
> ArrayIndexOutOfBoundsException when i = 6400
> }
> {code}
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